package com.jing.mall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.jing.mall.common.to.es.SkuEsModel;
import com.jing.mall.common.utils.R;
import com.jing.mall.search.config.ElestaicSearchConfig;
import com.jing.mall.search.contant.EsConstant;
import com.jing.mall.search.feign.ProductFeignService;
import com.jing.mall.search.service.MallSearchService;
import com.jing.mall.search.vo.AttrRespVo;
import com.jing.mall.search.vo.BrandVo;
import com.jing.mall.search.vo.SearchParam;
import com.jing.mall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.TotalHits;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    RestHighLevelClient restHighLevelClient;
    @Autowired
    ProductFeignService productFeignService;

    /**
     * 去es中进行检索
     *
     * @param param
     * @return SearchResult
     */
    @Override
    public SearchResult search(SearchParam param) {
        SearchResult result = null;
        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //2.执行检索请求
            SearchResponse response = restHighLevelClient.search(searchRequest, ElestaicSearchConfig.COMMON_OPTIONS);
            System.out.println(response.toString());
            //3.分析响应数据并封装成我们需要的数据
            result = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();
        ArrayList<SkuEsModel> skuEsModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                skuEsModels.add(skuEsModel);
            }
        }
        result.setProducts(skuEsModels);
        Aggregations aggregations = response.getAggregations();
        //2.当前所有商品涉及到的属性信息
        ArrayList<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            //得到属性的名字
            String attr_name_agg = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attr_name_agg);
            //得到属性的值
            List<String> attr_value_agg = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrValue(attr_value_agg);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        //3.当前所有商品涉及到的品牌信息
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        ArrayList<SearchResult.BrandVo> brandVos = new ArrayList<>();
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);
            //2.得到品牌名
            String brand_name_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brand_name_agg);
            //3.得到品牌的图片
            String brand_img_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brand_img_agg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4.当前所有商品涉及到的分类信息
        ParsedLongTerms catalog_agg = aggregations.get("catalog_agg");
        ArrayList<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : catalog_agg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String keyAsName = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(keyAsName);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        //5.分页信息、页码
        result.setPageNum(param.getPageNum());
        //5.分页信息、总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //5.分页信息、总页码
        int totalPage = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGESIZE : (int) total / EsConstant.PRODUCT_PAGESIZE + 1;
        result.setTotalPages(totalPage);
        ArrayList<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPage; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        /**
         * 面包屑导航
         */
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(item -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = item.split("_");
                navVo.setNavValue(s[1]);
                result.getAttrIds().add(Long.parseLong(s[0]));
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrRespVo attr = r.getData("attr", new TypeReference<AttrRespVo>() {
                    });
                    navVo.setNavName(attr.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                String replace = replaceQueryString(param, item,"attrs");
                navVo.setLink("http://search.mall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(navVos);
        }
        if (param.getBrandId()!=null&&param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //远程查询品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode()==0){
                //远程调用成功
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                String replace="";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName()+";");
                     replace = replaceQueryString(param, "brandIs",brandVo.getBrandId()+"");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.mall.com/list.html?" + replace);
            }
            navs.add(navVo);
        }
        return result;
    }

    private String replaceQueryString(SearchParam param, String key,String value) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String replace = param.get_queryString().replace("&"+key+"=" + encode, "");
        return replace;
    }

    /**
     * 准备检索请求
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //DSL构建语句
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        /**
         * 查询：模糊匹配，过滤（按照属性、分类、品牌，价格区间、库存）
         */
        //1.构建了boolquery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 构建bool-must-模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2 bool -filter按照三级分类id查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2 bool -filter按照品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1.2 bool -filter按照属性id查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            param.getAttrs().forEach(item -> {
                //attrs=1_5寸:8寸&2_16G:8G
                BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
                //attrs=1_5寸:8寸
                String[] s = item.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");//这个属性检索用的值
                boolQueryBuilder.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                boolQueryBuilder.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", boolQueryBuilder, ScoreMode.None);
                boolQuery.filter(nestedQueryBuilder);
            });

        }
        //1.2 bool -filter按照库存进行查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }
        //1.2 bool -filter按照价格区间进行查询
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {
                rangeQuery.gte(s[0]);
                rangeQuery.lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
        searchSourceBuilder.query(boolQuery);
        /**
         * 排序，分页，高亮
         */

        //2,1 排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            searchSourceBuilder.sort(s[0], order);
        }
        //2.2 分页
        searchSourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        searchSourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            searchSourceBuilder.highlighter(highlightBuilder);
        }
        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        searchSourceBuilder.aggregation(brand_agg);
        //2.分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        searchSourceBuilder.aggregation(catalog_agg);
        //2.属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");

        //聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合分析出当前attr_id对应的所有可能的属性值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        searchSourceBuilder.aggregation(attr_agg);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder);
        return searchRequest;
    }
}
